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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e26507bec85a166d25e7911d10a3a3b6da4a1ff3c9c8d42325131500eb92f8' 
  AND token = 'p3+87ldNaS2uzcHw8iJaJMysnBdVT7/L2s+AvnrB1dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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