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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b212b5bdc4063b4b36899e9b053a58df4997bbe2ced072703cd75d35292109' 
  AND token = 'E+LVGm/fAmM7Vbti7QqtljYN+R5SuvqcFzPRm2d8ny0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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