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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a8f84dd8ba9ee685b376c1fff32472e18a75afa91cc20a236888da9c963a7f' 
  AND token = 'pntvKBCS/+NUNI7oOLKB3Gn00Oabxj0wxXarSCCY3o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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