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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a677061c4302cfc88db81901add186a8938f2573edfcbea28b2afc6b70a25cc' 
  AND token = 'b/TIc4gEcp5FY0uHKnG9xQBmt8H5Q9e0tHIp+TsxHrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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