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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0ece6df77bf306d52e056406381812f5c3f06f5c91d758ce134aba3b970159' 
  AND token = 'OCoEwHXx5kaPUt+W20e+cWekBmG27D2SBLDCq1VMjOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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