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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3e51828a1ab5ad612d562e06fa79f8eb41268b8ccd5b9473ddfa573add5918' 
  AND token = 'j6XTQ1X2O4SHEAmd/4+6CUjpVsmTlTexatVjyAD/TdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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