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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c198d902917a38cb14768485dbf8ba5c9ec000a98f7484afe3dbb5c70180b19' 
  AND token = 'r8wD+dmtXXGLdgkrCHN2BH+OtC88Kcy7xL9nInClaPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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