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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12afd9df25741237d6ac484cc0d8043aabe500c015a33c55f5774862d89c1c8' 
  AND token = 'qizDxI/nUbbBw2KIbDzUrWMpDIUID3Z2OCQOYYwu0JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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