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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ee71144985d9edc9faeeaba7366f16e1cd4ed5fcf9506337cf78b312428fa7' 
  AND token = 'i+NJ3UcFeYATLBFaGH54A8RNuV9G3Ge42a82OaNfYHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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