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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00bcae56ae2f9fd8b960533498a17b524aa2d0fdfd239931222c98b5154c356' 
  AND token = 'Fzg5CkfaYd7NiDWc/S8MtN/KQ9pOJciZLSUvYitYW1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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