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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7691fc98147ee4ad94a76c66c1aacc8a248a0f0af85bee832bdcaa53a0f4b890' 
  AND token = 'a1Wfx2s6pz3Ug3qK974cIGSiTrhtwwZqNftM2C1iWFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}