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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb176107c0437995515fbae2a7b369a82e92af72bfaae129ea2fef6d3f41b21' 
  AND token = 'd1TTzJ0TVORt7zY60C/HTCTrRpFg/uafUhV+Z/avmm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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